Toyota 2015 Prius Owner's Manual page 537

5-2. Steps to take in an emergency
Stop the vehicle immediately.
A buzzer sounds and a warning message is shown on the multi-infor-
mation display. The following warnings indicate the possibility of dam-
age to the vehicle that may lead to an accident. Immediately stop the
vehicle in a safe place and contact your Toyota dealer.
Warning message
518
PRIUS_OM_OM47A17U_DVD_(U)
Indicates an abnormal engine oil pressure.
The warning light may turn on if the engine oil pres-
sure is too low.
Indicates a malfunction in the hybrid system.
In this situation, there is a possibility that the parking
lock mechanism will not work.
When parking, park the vehicle on a flat surface and
apply the parking brake securely.
Details